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That, at least, had long been the conventional wisdom, but in recent years, scientists have come to learn that by some measures, the solar system fairly sloshes with water. Mars, we now know, was once as wet as Earth and still harbors ice and perhaps liquid water. The moon is thought to have water locked in permafrost at its poles. Jupiter's moon Europa is probably home to a globe-girdling ocean beneath a thin rind of ice, and its Jovian sisters Callisto and Ganymede appear to be icy and wet too. Now, according to new findings by the Cassini...
...Cassini probe, which was launched from Earth in 1997 and arrived at Saturn in 2004, had a big job to do: principally, studying the planet's elaborate ring system and taking a census of its litter of moons - of which 53 have been found and named. Of those, Enceladus, discovered in 1789, held some of the deepest secrets. (See pictures of Saturn...
Even viewed from Earth, the 310-mile-diameter moon appears bright white, almost as if covered in ice or snow; when the Voyager 1 spacecraft arrived at Saturn in 1981, it confirmed that long-distance impression. More intriguing was the way Enceladus behaved. Embedded inside Saturn's E ring - the outermost of the eight bands that make up the ring system - Enceladus seemed to orbit with a thick clump of ring matter trailing behind it, almost as if it were dragging the material in its gravitational wake. What astronomers suspected instead - and what Voyager confirmed - was that Enceladus...
...week, the U.S. House of Representatives will have passed landmark global-warming legislation. But you might not know it from the near unanimously bad reviews so many different interested parties are giving it. Groups as disparate as the U.S. Chamber of Commerce, Greenpeace, Friends of the Earth, the Farm Bureau, the American Petroleum Institute and the National Association of Manufacturers have expressed either strong concerns or outright opposition to the bill...
...easy task; the final (some would say watered down) deal is a hard-won, middle-of-the-road bill that is still likely to lose Democratic votes from both the right and the left, though it may gain some moderate Republicans. (Read "Global Warming: A Hot Earth Could Worsen Allergies and Kidney Stones...